Hi, I am working with the Q403 on testing power amps. My setup is a dummy load and Q403 and an oscilloscope connected to the amp’s output. Some amplifiers don’t like the input and output grounds connected and make oscillations and ground loops. I was considering making the connection of the 403 differential on the load and scope, but it enters noise into the system for some reason…
so my thinking is whether it is possible to modify my 403 to make the oscillator section floating from ground somehow? Or I need to build a special floating dummy load with buffered single-ended output for oscilloscope///
or even buing a 451 modifieng it to not block dc for my neads and attenuate 20 db instead of 12. with bigger power resistors…